This listing is for a Type S Dioptric Adjustment lens for a Canon FTb camera viewfinder (and other compatible cameras). It is a +1.0 dioptre adjustment that fits onto the eyepiece holder of the camera via side guides with stainless steel retaining springs.

Canon Dioptric Adjustment lenses provide near or far-sighted users a clear viewfinder image without the use of eyeglasses. This is sometimes crucial to people who need to wear glasses as the eye relief of the FTb finder is fairly low at ~16mm and glasses could cause problems with seeing the entire frame.

The box for the product has wear, but the lens has been well looked after and is clean, clear and scratch-free.
The cosmetic condition can be seen by photographs displayed that are images of the actual item.